My 1990 sub wont start, need a little help please.

Its been 2 years since I logged on (No problems at all with my rig) However, I just tried to start my beast and it just cranks over no combustion. I'm thinking fuel pump but I thought I'd better ask first. Should you be able to hear the pump with the ignition in the on position? Is there a designated fuse for this? She ran great before I parked her 2 days ago. Yes, there is plenty of gas in the tank. Thanks.

Yes, fuses are a good place to start. Check fuses for fuel pump and ignition. You may have also lost the "pump prime" relay. If so, it would still start after you crank the engine long enough to get some oil pressure.

check your ignition module and pick up module in the distributor. make sure there is a spark. Pull out a spark plug and keep the wire connected. Ground it against the block or something else ,and try to start. if there is no spark, its an ignition problem, otherwise, probably fuel.

Have someone spray some starting fluid down the throttle body (or dump a little gas in) while you try to start it. If it starts then, it is a fuel problem. Make sure the fuse and relay are good first, then replace the bad pump.

You should be able to hear the fuel pump come on. When you start it, turn the key to "on" and leave it there for a second. You'll hear a little whine and a little click. That's the fuel pump. I would check for spark though.

Useful Searches

>
About Us>
>
In May of 1999 CK5 started out as a tribute to America's favorite 4x4 utility truck. Since then it has grown to be
a leader among full size Chevrolet K5 Blazer and GMC Jimmy web sites across the Internet. CK5 has since expanded
to include the C/K series GM Truck and Suburban as well as past and present GM models.
>>
With its technical articles, factory specifications, photo gallery, classifieds, active message forum, product
reviews and original automotive content it's an unbeatable source.